Not quite as good as the bundle a few weeks back - £7.31 or something for both!
You won't miss anything, other than a great game. There's no real link between the games (although you do get to meet the L4D1 peeps in The Passing).I was just gonna buy l4d2, do I really need to have played the first one or what? What would I be missing by not buying the the first one?